Strip comments

[rstacruz]

This is a very interesting concept!

It seems to report some modules as "Failed to treeshake" because, they will include some comments:

/* global HTMLElement */

// @flow

// @flow

Failed to tree-shake index.js

This example in particular is pretty common. If I use this file, the comment will be printed out:

/*
 * I am a comment that will be included.
 */

export function xyz () {
  // ...
}

[funkybob]

I've noticed, also, that it's only comments starting on the very first line of a file.
I inserted a blank line at the start of the files, and the comments were stripped.